Water-tube boiler.



|0.v669,772. 4 Pafnted Mal. |`2,|90|.

' E'. R. STETTINIUS.

' WATER TUBE BlLEl'iA (Appueman'med mr. a, 1900.2 llo Model.) 2Sheets-Sheet I.

Edy/Wc?! 103:

No. 669,772. Patented Mar. l2, Ism. E. n. semlus.

WATER TUBE solLEn. (Application led Mar. 3, 1900* (No M ndelJ i V 2Sheets-'Sheet 2.

@m Mm MSM. @4L/ v @f wsa UNITED STATES PATENT OFFICE.

EDWARD R. STETTINIUS, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE STIRLINGCOMPANY, OF SAME PLACE.

WATER-TU BE BOILER.

SPECIFICATION forming part of Letters Patent No. 669,772, dated. vMarchl2, 1901.

Application filed March 3, 1900. Serial No. 7,216. (No model.)

T0 all whom it may concern.-

Beit known that I, EDWARD R. STETTINIUs, a citizen ofthe United States,residing at Ohicago, in the county of Cook and State of Illinois,haveinvented a new and useful Improvement in Water-T ube Boilers, ofwhich the following is a specification.

The object of my invention is to improve the vertical water-tube boilerof the type commonly known as the Stirling`boiler; and the inventionconsists in the features and combinations hereinafter described andclaimed.

In the accompanying drawings, Figure l is a cross-section of my improvedboiler, the middle elevated steam and water drum, front lower mud-drum,and connecting circulatingpipe being shown in end elevation and thecirculating-pipe being outside the wall or setting; Fig. 2, alongitudinal sectional elevation of the boiler, showing thecirculatingpipes inside the boiler-setting; .and Fig. 3, a similar viewshowing the circulatingpipes embedded in the walls or setting.

A, A', and A2 are elevated steam and water drums, ct pipes communicatingbetween the steam-spaces thereof, and a pipes communicating between thewater-spaces of the front and middle ones thereof; B,lower mud-dru ms;C, banks of tubes connecting the elevated steam and water drums with thelower muddrums; D, circulating-pipes connecting the ends of the middleelevated steam and water drum with the ends of the front lower muddrum;E, the fireplace and e a tire-brick arch over the same, and F fire-brickpartitions in rear of and adjacent to the front and middle banks oftubes, respectively.

Thev Stirling type of boiler, to which my invention relates, is so wellknown that I do not,

consider it necessary to describe its construction or operation indetail. In this view, and because they are clearly shown in thedrawings, no description is considered necessary of the elevated steamand water drums and connecting-pipes, lower mud-drums, banks of tubesconnecting the lower mud-drums with the elevated steam and water drums,firebrick arches and partitions, and other features in com mon use asparts thereof. In addition to these parts or features, however, Iprovide special circulating-pipes between the middle elevated steam andwater drum and the front lower mud-drum, which circulatingpipescommunicate with these drums at or near their ends, respectively, andare embedded in the walls or setting of the boiler or placed inside oroutside thereof, as desired. In Fig. l the circulating-pipe is shownoutside the wall or setting, and its mate at the other end, when two areused, is to be arranged in the same way. In Fig. 2 both thecirculating-pipes are shown inside the wall or setting, and in Fig. 3they are both shown embedded in the Wall or setting. As already stated,these pipes communicate with the end portions ofthe drumsto which theyare attached, respectively; but their connections are not necessarily atthe extreme ends of the drums, connection near the ends beingsufficient. As shown, feed-water is to be introduced into the rearmud-drum; butit may be introduced into the rear elevated steam and waterdrum or elsewhere, as desired.

In filling, the feed-water being introduced into the rear mud-drumpasses up through the rear and middle banks of tubes into the rear andmiddle elevated steam and Water drums, and from the middle steam andwater drum it passes down through the circulating-pipes to the front mud-drum and thence up through the front bank of tubes to the frontelevated steam and Water drum, also from the middle steam and Water drumthrough the connecting-pipes to the front steam and Water drum. Inoperation, the front bank of tubes being in the hottest part of theboiler, the most rapid upward circulation will be through this bank; butthe circulating-pipes permit a constant downlow and supply of water totake the place of water converted into steam in the front bank of tubesand also the place of water passing from the front steam and water druminto the middle steam and water drum orelsewhere. The water-spaces ofthe front and middle steam and water drums communicating with eachother, water passes from one of these drums to the other as required bycirculation and other conditions. In other words, the circulating andconnecting pipes provide for a powerful circulation of water up thefront bank of tubes and across from IOO the front steam and water drumto the middle steam and water drum and down to the front mud-drum, andso on in circuit, the practical eect being that the tubes of the frontbank are more completely filled with cooler water or water free fromsteam and transmission of heat in this bank thereby greatly increased.In addition to this primary circulation there are local circulations inthe tubes of the middle and rear banks, respectively, and these localcirculations serve to heat the feed-water, and thereby provide forseparation and a settlement of scaleforming matter in the rear andcooler parts of the boiler. If feedwater be introduced in the rear ormiddle steam and wat-er drum or elsewhere in the rear part of theboiler, the

y used, as desired.

circulation will be practically unchanged.

The circulating-pipes being of larger diameter than the diameter of thetubes of the several banks and being located in a comparatively coolpart or" the boiler provide for a constant and abundant supply of waterfrom the rear part of the boiler to the front part, and this withouthaving serious counter-currents in the tubes furnishing theheating-surface and primarily intended for the generation of steam.

Although I have shown and described one circulating-pipe at each end ofthe boiler, it will be understood that one or more may be It will alsobe understood that instead of two circulating-pipes, one at each end, asingle circulating-pipe may be used at one end only.

I claim- 1. In a water-tube boiler, the combination of a front elevatedsteam and water drum, a middle elevated steam and water drum, a rearelevated steam and water drum, pipes communicating between thesteam-spaces of said drums, respectively, pipes communicating betweenthe water-spaces of the front and middle of said drums, a front lowermuddrum, a rear lower mud-drum, banks of tubes connecting the rearmud-drum with the middle and rear steam and water drums, respectively, abank of tubes connecting the front mud-drum with the front steam andWater drum, a circulating pipe orpipes at or near the ends of andcommunicating between the middle steam and water drum and front muddrumlocated in cool relation to the boiler- ,setting and giving an auxiliarycirculation between the two drums at the end, means for introducingfeed-water, and means for drawing od steam, substantially as described.

2. In a water-tube boiler, the combination of a front elevated steam andwater drum, a middle elevated steam and water drum, a rear elevatedsteam and water drum, pipes communica ting between the steam-spaces ofsaid drums, respectively, pipes communicating between the water-spacesof the front and middle of said drums, a front lower muddrum, a rearlower mud-drum, banks of tubes connecting the rear mud-drum with themiddle and rear steam and water drums, respectively, a bank of tubesconnecting the front mud-drum with the front steam and water drum, acirculating-pipe at each end of and communicating between the middlesteam and water drum and the front mud-drum located inside the boilerwall or setting, and giving an auxiliary circulationl between the twodrums at each end, means for introducing feed-water, and means fordrawing off steam, substantially as described.

EDWARD R. STETTINIUS.

Witnesses:

EPHRAIM BANNING, THOMAS A. BANNING.

